1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1990, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94"; 41 #endif /* not lint */ 42 #endif 43 #include <sys/cdefs.h> 44 #include <sys/stat.h> 45 #include <sys/param.h> 46 #include <sys/mount.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fts.h> 52 #include <grp.h> 53 #include <locale.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <sysexits.h> 59 #include <unistd.h> 60 61 static int dflag, eval, fflag, iflag, vflag, Wflag, stdin_ok; 62 static int rflag, Iflag, xflag; 63 static uid_t uid; 64 static volatile sig_atomic_t info; 65 66 static int check(const char *, const char *, struct stat *); 67 static int check2(char **); 68 static void checkdot(char **); 69 static void checkslash(char **); 70 static void rm_file(char **); 71 static void rm_tree(char **); 72 static void siginfo(int __unused); 73 static void usage(void); 74 75 /* 76 * rm -- 77 * This rm is different from historic rm's, but is expected to match 78 * POSIX 1003.2 behavior. The most visible difference is that -f 79 * has two specific effects now, ignore non-existent files and force 80 * file removal. 81 */ 82 int 83 main(int argc, char *argv[]) 84 { 85 int ch; 86 char *p; 87 88 (void)setlocale(LC_ALL, ""); 89 90 /* 91 * Test for the special case where the utility is called as 92 * "unlink", for which the functionality provided is greatly 93 * simplified. 94 */ 95 if ((p = strrchr(argv[0], '/')) == NULL) 96 p = argv[0]; 97 else 98 ++p; 99 if (strcmp(p, "unlink") == 0) { 100 if (argc == 2) 101 rm_file(&argv[1]); 102 else if (argc == 3 && strcmp(argv[1], "--") == 0) 103 rm_file(&argv[2]); 104 else 105 usage(); 106 exit(eval); 107 } 108 109 rflag = xflag = 0; 110 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1) 111 switch(ch) { 112 case 'd': 113 dflag = 1; 114 break; 115 case 'f': 116 fflag = 1; 117 iflag = 0; 118 break; 119 case 'i': 120 fflag = 0; 121 iflag = 1; 122 break; 123 case 'I': 124 Iflag = 1; 125 break; 126 case 'P': 127 /* Compatibility no-op. */ 128 break; 129 case 'R': 130 case 'r': /* Compatibility. */ 131 rflag = 1; 132 break; 133 case 'v': 134 vflag = 1; 135 break; 136 case 'W': 137 Wflag = 1; 138 break; 139 case 'x': 140 xflag = 1; 141 break; 142 default: 143 usage(); 144 } 145 argc -= optind; 146 argv += optind; 147 148 if (argc < 1) { 149 if (fflag) 150 return (0); 151 usage(); 152 } 153 154 checkdot(argv); 155 checkslash(argv); 156 uid = geteuid(); 157 158 (void)signal(SIGINFO, siginfo); 159 if (*argv) { 160 stdin_ok = isatty(STDIN_FILENO); 161 162 if (Iflag) { 163 if (check2(argv) == 0) 164 exit (1); 165 } 166 if (rflag) 167 rm_tree(argv); 168 else 169 rm_file(argv); 170 } 171 172 exit (eval); 173 } 174 175 static void 176 rm_tree(char **argv) 177 { 178 FTS *fts; 179 FTSENT *p; 180 int needstat; 181 int flags; 182 int rval; 183 184 /* 185 * Remove a file hierarchy. If forcing removal (-f), or interactive 186 * (-i) or can't ask anyway (stdin_ok), don't stat the file. 187 */ 188 needstat = !uid || (!fflag && !iflag && stdin_ok); 189 190 /* 191 * If the -i option is specified, the user can skip on the pre-order 192 * visit. The fts_number field flags skipped directories. 193 */ 194 #define SKIPPED 1 195 196 flags = FTS_PHYSICAL; 197 if (!needstat) 198 flags |= FTS_NOSTAT; 199 if (Wflag) 200 flags |= FTS_WHITEOUT; 201 if (xflag) 202 flags |= FTS_XDEV; 203 if (!(fts = fts_open(argv, flags, NULL))) { 204 if (fflag && errno == ENOENT) 205 return; 206 err(1, "fts_open"); 207 } 208 while (errno = 0, (p = fts_read(fts)) != NULL) { 209 switch (p->fts_info) { 210 case FTS_DNR: 211 if (!fflag || p->fts_errno != ENOENT) { 212 warnx("%s: %s", 213 p->fts_path, strerror(p->fts_errno)); 214 eval = 1; 215 } 216 continue; 217 case FTS_ERR: 218 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno)); 219 case FTS_NS: 220 /* 221 * Assume that since fts_read() couldn't stat the 222 * file, it can't be unlinked. 223 */ 224 if (!needstat) 225 break; 226 if (!fflag || p->fts_errno != ENOENT) { 227 warnx("%s: %s", 228 p->fts_path, strerror(p->fts_errno)); 229 eval = 1; 230 } 231 continue; 232 case FTS_D: 233 /* Pre-order: give user chance to skip. */ 234 if (!fflag && !check(p->fts_path, p->fts_accpath, 235 p->fts_statp)) { 236 (void)fts_set(fts, p, FTS_SKIP); 237 p->fts_number = SKIPPED; 238 } 239 else if (!uid && 240 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 241 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 242 lchflags(p->fts_accpath, 243 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0) 244 goto err; 245 continue; 246 case FTS_DP: 247 /* Post-order: see if user skipped. */ 248 if (p->fts_number == SKIPPED) 249 continue; 250 break; 251 default: 252 if (!fflag && 253 !check(p->fts_path, p->fts_accpath, p->fts_statp)) 254 continue; 255 } 256 257 rval = 0; 258 if (!uid && 259 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) && 260 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE))) 261 rval = lchflags(p->fts_accpath, 262 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)); 263 if (rval == 0) { 264 /* 265 * If we can't read or search the directory, may still be 266 * able to remove it. Don't print out the un{read,search}able 267 * message unless the remove fails. 268 */ 269 switch (p->fts_info) { 270 case FTS_DP: 271 case FTS_DNR: 272 rval = rmdir(p->fts_accpath); 273 if (rval == 0 || (fflag && errno == ENOENT)) { 274 if (rval == 0 && vflag) 275 (void)printf("%s\n", 276 p->fts_path); 277 if (rval == 0 && info) { 278 info = 0; 279 (void)printf("%s\n", 280 p->fts_path); 281 } 282 continue; 283 } 284 break; 285 286 case FTS_W: 287 rval = undelete(p->fts_accpath); 288 if (rval == 0 && (fflag && errno == ENOENT)) { 289 if (vflag) 290 (void)printf("%s\n", 291 p->fts_path); 292 if (info) { 293 info = 0; 294 (void)printf("%s\n", 295 p->fts_path); 296 } 297 continue; 298 } 299 break; 300 301 case FTS_NS: 302 /* 303 * Assume that since fts_read() couldn't stat 304 * the file, it can't be unlinked. 305 */ 306 if (fflag) 307 continue; 308 /* FALLTHROUGH */ 309 310 case FTS_F: 311 case FTS_NSOK: 312 default: 313 rval = unlink(p->fts_accpath); 314 if (rval == 0 || (fflag && errno == ENOENT)) { 315 if (rval == 0 && vflag) 316 (void)printf("%s\n", 317 p->fts_path); 318 if (rval == 0 && info) { 319 info = 0; 320 (void)printf("%s\n", 321 p->fts_path); 322 } 323 continue; 324 } 325 } 326 } 327 err: 328 warn("%s", p->fts_path); 329 eval = 1; 330 } 331 if (!fflag && errno) 332 err(1, "fts_read"); 333 fts_close(fts); 334 } 335 336 static void 337 rm_file(char **argv) 338 { 339 struct stat sb; 340 int rval; 341 char *f; 342 343 /* 344 * Remove a file. POSIX 1003.2 states that, by default, attempting 345 * to remove a directory is an error, so must always stat the file. 346 */ 347 while ((f = *argv++) != NULL) { 348 /* Assume if can't stat the file, can't unlink it. */ 349 if (lstat(f, &sb)) { 350 if (Wflag) { 351 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR; 352 } else { 353 if (!fflag || errno != ENOENT) { 354 warn("%s", f); 355 eval = 1; 356 } 357 continue; 358 } 359 } else if (Wflag) { 360 warnx("%s: %s", f, strerror(EEXIST)); 361 eval = 1; 362 continue; 363 } 364 365 if (S_ISDIR(sb.st_mode) && !dflag) { 366 warnx("%s: is a directory", f); 367 eval = 1; 368 continue; 369 } 370 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb)) 371 continue; 372 rval = 0; 373 if (!uid && !S_ISWHT(sb.st_mode) && 374 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) && 375 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE))) 376 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE)); 377 if (rval == 0) { 378 if (S_ISWHT(sb.st_mode)) 379 rval = undelete(f); 380 else if (S_ISDIR(sb.st_mode)) 381 rval = rmdir(f); 382 else 383 rval = unlink(f); 384 } 385 if (rval && (!fflag || errno != ENOENT)) { 386 warn("%s", f); 387 eval = 1; 388 } 389 if (vflag && rval == 0) 390 (void)printf("%s\n", f); 391 if (info && rval == 0) { 392 info = 0; 393 (void)printf("%s\n", f); 394 } 395 } 396 } 397 398 static int 399 check(const char *path, const char *name, struct stat *sp) 400 { 401 int ch, first; 402 char modep[15], *flagsp; 403 404 /* Check -i first. */ 405 if (iflag) 406 (void)fprintf(stderr, "remove %s? ", path); 407 else { 408 /* 409 * If it's not a symbolic link and it's unwritable and we're 410 * talking to a terminal, ask. Symbolic links are excluded 411 * because their permissions are meaningless. Check stdin_ok 412 * first because we may not have stat'ed the file. 413 */ 414 if (!stdin_ok || S_ISLNK(sp->st_mode) || 415 (!access(name, W_OK) && 416 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) && 417 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))) 418 return (1); 419 strmode(sp->st_mode, modep); 420 if ((flagsp = fflagstostr(sp->st_flags)) == NULL) 421 err(1, "fflagstostr"); 422 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ", 423 modep + 1, modep[10] == ' ' ? "" : " ", 424 user_from_uid(sp->st_uid, 0), 425 group_from_gid(sp->st_gid, 0), 426 *flagsp ? flagsp : "", *flagsp ? " " : "", 427 path); 428 free(flagsp); 429 } 430 (void)fflush(stderr); 431 432 first = ch = getchar(); 433 while (ch != '\n' && ch != EOF) 434 ch = getchar(); 435 return (first == 'y' || first == 'Y'); 436 } 437 438 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0') 439 static void 440 checkslash(char **argv) 441 { 442 char **t, **u; 443 int complained; 444 445 complained = 0; 446 for (t = argv; *t;) { 447 if (ISSLASH(*t)) { 448 if (!complained++) 449 warnx("\"/\" may not be removed"); 450 eval = 1; 451 for (u = t; u[0] != NULL; ++u) 452 u[0] = u[1]; 453 } else { 454 ++t; 455 } 456 } 457 } 458 459 static int 460 check2(char **argv) 461 { 462 struct stat st; 463 int first; 464 int ch; 465 int fcount = 0; 466 int dcount = 0; 467 int i; 468 const char *dname = NULL; 469 470 for (i = 0; argv[i]; ++i) { 471 if (lstat(argv[i], &st) == 0) { 472 if (S_ISDIR(st.st_mode)) { 473 ++dcount; 474 dname = argv[i]; /* only used if 1 dir */ 475 } else { 476 ++fcount; 477 } 478 } 479 } 480 first = 0; 481 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') { 482 if (dcount && rflag) { 483 fprintf(stderr, "recursively remove"); 484 if (dcount == 1) 485 fprintf(stderr, " %s", dname); 486 else 487 fprintf(stderr, " %d dirs", dcount); 488 if (fcount == 1) 489 fprintf(stderr, " and 1 file"); 490 else if (fcount > 1) 491 fprintf(stderr, " and %d files", fcount); 492 } else if (dcount + fcount > 3) { 493 fprintf(stderr, "remove %d files", dcount + fcount); 494 } else { 495 return(1); 496 } 497 fprintf(stderr, "? "); 498 fflush(stderr); 499 500 first = ch = getchar(); 501 while (ch != '\n' && ch != EOF) 502 ch = getchar(); 503 if (ch == EOF) 504 break; 505 } 506 return (first == 'y' || first == 'Y'); 507 } 508 509 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2]))) 510 static void 511 checkdot(char **argv) 512 { 513 char *p, **save, **t; 514 int complained; 515 516 complained = 0; 517 for (t = argv; *t;) { 518 if ((p = strrchr(*t, '/')) != NULL) 519 ++p; 520 else 521 p = *t; 522 if (ISDOT(p)) { 523 if (!complained++) 524 warnx("\".\" and \"..\" may not be removed"); 525 eval = 1; 526 for (save = t; (t[0] = t[1]) != NULL; ++t) 527 continue; 528 t = save; 529 } else 530 ++t; 531 } 532 } 533 534 static void 535 usage(void) 536 { 537 538 (void)fprintf(stderr, "%s\n%s\n", 539 "usage: rm [-f | -i] [-dIPRrvWx] file ...", 540 " unlink [--] file"); 541 exit(EX_USAGE); 542 } 543 544 static void 545 siginfo(int sig __unused) 546 { 547 548 info = 1; 549 } 550